Motor mounting



July 3l, 1928.

H. H. MURRAY MOTOR MOUNTING Filed Nov. 15, 192s 2 sheets-sheet l l 0 a"g 1 7**610 K if .null-n ||||||||||||||||||||||||l|||||||||||l :n .v j

4 /N VEN To? nl? 15,7 .Marra j w/ r/vsss v er f a pdrowys 2 Sheets-Sheet2 H. H. MURRAY MOTOR MOUNTING lFiled NOV. l5, 1925 July 3l, 1928.

WITNESS Patented iluly 31, 19.28.v

UNITED STATES PATENT OFFICE.

HENRY H. MURRAY, F RIVEBTON, NEW JERSEY, ASSIGNOR TO VICTOR TALKINGMACHINE COMPANY, A CORPORATION 0F NEW JERSEY.

-Moron.' MOUNTING.

Y Application filed November 15, 1923. Serial No. 674,907.

My invention relates to lnountings upon which motors are supported, andmore p arti'cularly to vthat type or kind of mounting wherein the motor'is yieldingly supported,

with a view of reducing or entirely ellminating motor noises which arefrequently disturbing,` distracting and altogether ob]ec tionableparticularly when the motor 1s employed to Aoperate amusical instrument.Mo-

tors for operating musical instruments, such as talking machines,generally operate comparatively quietly, so far as any audible soundsare concerned, but since certain parts of such motorsusually rotate atrelatively 15 high speeds there is generally some slight sound produceddue to the engagement of the gearing therein and to vibration of theVmotor occasioned probably lby some unbal-A anced portion of the rapidlymoving parts. But such motors arev usually comparatively rigidly mountedand secured to a motorboard or to a partition or wall of the cabinet inwhich the motor is housed and these slight 'noises and the vibrations ofthe motor are thus directly conducted or transmitted to a Wall of amorel or less sound-resonant chamber, where they are considerablyamplified or augmented,`often to such an extent as to divert attention'from the musical selection being reproduced by a motor driveninstrument. I The object of myinvention is to provide a mounting forsuch a motor which will permit the motor as a whole/to vibrate slightly,While` running, without transmitting those vibrations to any part of thecabinet structure or motor-board, and to confine those vibrations to themotor structure itself with the result that the vibration of the motormay produce no audible sound.

A further object of my inventionis to actually reduce the motor noisesby s up porting the motor structure upon reslllent springs, so that themotor mechanism 1s yieldingly or floatingly mounted with respect to themain support therefor and may vibrate, within narrow limlts, withoutactual contact with any rigid relatively unyielding resonant structuresvv placed therefrom during shipment, and at A further object of myinvention is to` the same time to positively prevent any drect contactor' engagement of the motor mechanism with any rigid part of thestructure in or o n which it may be mounted.'

A further object is to sound-insulate the support, which may be amotor-board, from the motor and from the rods by which the motor ismounted on the motor-board, and to sound-insulate the motor-frame fromsaid rods and from said support so that there is no continuous rigidmetallic connection or Contact between said parts.

A further object of my invention is to so mount the motor with-respectto its suppbrt that the entire Weight of the motor is carriedandbalanced by resilient springs under compression which is due only to theWeight of the motorframe and the parts carried thereby, said motor whenbeing operated being normally out of contact or engagement with saidsupport or any other object except said springs, so that it is free tovibrate and to.` move slightly i-n any direction unrestrained in any Inanner except by the resiliency of said springs on which it rests andgravity. 1

Other objects of my invention will appear in the yspecification'andclaim below.

Referring nowto the drawings, formin a part of this specification',and'in which the 35 sa'me reference characters vare emplo ed throughoutto designate the same parts, ig-

ure lis a side elevationalview of a talking V machine motor secured to amotor-board of a talking machine cabinet, which board is sectionalv on avertical plane passing through the-talking machine spindle, said motorbeing yieldingly or flgoatingly mounted on said board or support inaccordance with my invention. Fig. 2 is a plan View of the v95 bottomside of the motor shown in Fig. 1 and of the three-point yieldingmounting therefor. f

Fig. 3 is a vertical sectional view on a somewhat larger scale than thatof Figs. 1 100 and 2 of one ofthe yielding vibration-absorbingsound-insulating,supports for a motor, all the parts .being in verticalsection` except the central rod or bolt, vwhich isv shown in elevation;and

Fig. 4 is a side elevational view'of. the,y structure shown in Fig. 3.

In Figs. 1' and 2 there is shown a motor 1 which may be of any type orform so lon as it comprises a rigid motor-frame 2, vvhic is usually of arigid cast or assembled metal construction. On this motor-frame may bemounted the spring-barrel or other power element 3, the gearing 4, thespindle 5 and the governing mechanism 6. Thismotor 1 is shown as mountedon the support 7, which may be a motor-board or a partition or wall `ofa talking machine cabinet or any relatively rigid support for any motor,the noises ofwhich it is desirable to reduce to a minimum. Forconvenience I will hereinafter in the detailed description refer to thissupport 7 as a motor-board.

In the particular structure shown in Figs. 1 and 2this motor 1 isdirectly supported on compression springs 8. preferably three in number,the lower ends'of said springs being supported by bolts or rods 9passing through the motor-board or support and the motor frame. rIhegeneral arrangement and disposition of these three spring supports isplainly shown in Fig. 2.

These three spring Supports are all alike and for a detailed descriptionthereof reference will now be had to Figs. 3 and 4,. The rod 9 ispreferably a bolt or screw having on its upper end a head 10 and havingits lower end provided with screw-threads 11 over which may be threadeda nut 12 and a lock nut 13. Thesupport or motorboard 7 is preferablyprovided with a cylindrical hole 14 passing lvertically therethrough,into which is snugly fitted a bushing 15 of any suitableyieldingnon-metallic sound-insulating material such as soft rubber. Theinside diameter of the bore of this bushing 15 is preferablysubstantially the same as the diameter of the rod or .bolt 9 so that thesaid rod fits snugly in this soft yielding bushing. Under the head 10 ofthe rod 9 I may provide a light steel washer 16 and between it and theupper side of the support on the motor-board 7, I provide a washer 17which is also of yielding non=metallic sound-insulating material, suchas felt. In this way the bolt or rod9 is completely sound-insulated fromthe support 7 but is not rigidly mounted therein, the lower end of thebolt being slightly movable transversely, against the resistance of theyielding resilient bushing 15. y

The motor-frame 2 is provided with three holes 1'8 adapted to aline withthe three holes 14 in the support 7 and it is through these holes thatthe bolts 9 freely pass.

Referring again to 3, hole 18 is preferably provided or lined with abushing 19 of yielding non-metallic sound-insulating material, such assoft rubber, and is shown as frictionally retained thereinby fittingsnugly into the hole 18. The bore or hole through this bushing 19 ispreferably substantially larger than the diameter of the bolt 9 passingtherethrough," so that the bolt 9 may normally be just out of Contactwith 'to the springs 8.

the interior of the bushing 19. The lower end 20 of this bushing 19preferably extends beyond or below the motor-frame 2 in the spacebetween the bolt 9 and the upper end of the compression spring toprevent the upper end of said spring from being slipped' transverselyinto direct contact or engagement with the bolt 9. The lower end of thespring 8 preferably rests upon a steel bushing 21 'projecting into thespace between the lower end of the spring 8 and the bolt 9 and having onits lower end a circular flange 22 adapted to rest squarely on the nut12. Between the support 7 and the mo'tor-frame 2 and preferablysurrounding the bolt 9, I may insert a pad, ring or washer 23 ofyielding non-metallic sound-insulating material, such as felt, so thatno actual Contact or engagement of the inotor-fra1ne 2 with the support7 is possible.Y Preferably this felt washer 23 rests onor is secured tothe side of the motor-frame 2 adjacent the support 7,

but it may be secured to the support 7 and spaced from the motor-frame.'lhe nut 12 is so adjusted that the upper surface of the washer' 23 isnormally out of engagement with the under side of the support 7.

By reason of this construction the motorframe and the parts carriedthereby are supported on a plurality of compression springs 8. Then themotor is running the motorframe as av whole may freely move or vibrateslightly on these springs without communicating that motion to the rods9 or to the support 7. The motor-frame may vibrate in any directionwithout transmitting such motion tb any part of the structure exceptBecause yielding nonmetallic sound-insulating material is interposedbetween the bolt head 10 and the supportl 7; between the shank of thebolt 9 and, the support 7 between the support 7 and the motor-frame 2;between the motor-frame 2 and the bolt 9; and between the upper ends ofthe springs 8 andthe bolts 9, there can be no direct contact orengagement between the bolts 9 and the support 7 4or between. the bolts9 and the motor-frame 2, or between the motor-frame and the support 7,and no vibration or movement ofthe motor or sound produced'by theoperation of the motor is transmitted or conveyed by any solldsound-conductive part to the support lor motor-board or to any wall orany partition of any chamber of a. talking machine structure.

As a result of this, any motor noises arey 'substantially eliminated,and if such a motor 1s used in a talking machine struc-ture there are nomotor noises produced which will reach the ear of one listening to thereproduction of sound from the talking machine.

It is to be understood that the nuts 12 are not for the purpose ofcompressing the felt washer 23 between the support 7 and the gresiliency of the springs as distinguished from elongating orl extendingthem, said weight being balanced by the tension of the springs.

Vhen the motor is properly positioned, that is to say, so resting thatthe support 7 is substantially horizontal, there should be a free spacebetween the felt washer 23 and the under side of the support so thatthere will he no actual contact between the motorrame 2 and the partscarried thereby, andv the support or motor-board 7 and the parts carriedthereby. Under these conditions, the rods or bolts 9 should also be justout of contact or engagement with the bore of the iexible bushings 19 sothat there will be a clearance or slight space between them. When soconstructed and positioned, the entire weight of the motor-frame 2 andthe parts carried thereby will be carried and balanced by the resilientsprings 8 and the motor-frame and the motor mechanism mounted thereinwill be out of 'actual contact or engagement with thesupport 7 and therods 9 or any other object and will be free to move slightly or vibratein any 'direction unrestrained by anything except the springs 8 uponwhich the weight of the motor is carried and gravity.

While I have describedwith considerable particularity the exactstructure illustrated in the drawings forming a part lof thisspecification, I .do not wish to be construed as being limited strictlythereto, inasmuch as many slight changes might be made therein withoutdeparting from they spirit and scope of my invention as set forth intheappended claim.

Having thus described my invention, I claim and desire to protect byLetters Patent of the United States:

The combination with a. motor-support and a motor comprising a rigidmotorframe, of a plurality of rigid rods mounted on said support andprojecting therefrom, metallic compression springs supported at theirlower ends by said rods and surrounding but spaced from. said rods landupon the upper ends of which said balanced, said frame being pro `dedwith a plurality of openings through which said rods respectively pass,yielding, sound-insulating material between said rods and said 'supportto pre-vent any actual contact of said rods with said support and topermit said rods to yield slightly with respect to said support, andbushings of yielding, sound-insulating' material openings in saidmotor-frame,`each bushing having a bore therethrough of a diametersubstantially ,larger than the diameter of the rod passing therethroughand projecting beyond said motor-frame into the space between a springand arod whereby said motor fra-me is free to slightly move and vibratein any direction with respect to said rods and with respect `to saidsupport unrestrained except by the resiliency of said springs and graviy.

In witness whereof, I have hereunto se! my hand this 13th day ofNovember, 1923 HENRY H. MURRAY.

motor-frame rests and by which the weight of said motor is fitted intosaid

